direct definitions give spelling error when debugger is active

[tangentstorm]

Noticed this in j902 on linux, reproduced on j903 beta-r for windows:

   dbg 1
   f =: {{ 3 + 'hello'}}
   f''
|domain error: f
|   3    +'hello'
|f[0]
      {{ y }}
|spelling error
|   {{ y }}
|   ^
      dbg 0
   {{ y }}
3 : 'y '

[HenryHRich]

Fixed for beta-s